.SIB File Extension
File TypeSibelius Score
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Musical score created with Sibelius music notation software; may be composed using software or a MIDI input device; can be used to play software instruments, but does not contain actual audio data.
SIB files can also be exported as standard MIDI (.MID) files from within Sibelius.